Hello. Thank you for writing to us.
You seem to have developed post-inflammatory
hyperpigmentation at the site of procedure.
Post-inflammatory hyperpigmentation/ PIH is a non-specific reaction to any inflammatory insult to skin and presents as darker skin at the site of inflammation.
PIH is due to increased synthesis of melanin and sun exposure plays a role in inducing new melanin synthesis apart from the inflammatory process itself.
Treatment would be directed are reducing synthesis of new melanin Or exfoliating already existing melanin Or both.
You should use a broad spectrum sunscreen throughout the day to protect it from further sun induced darkening.
A sunscreen that would ideal for you should have an SPF of at least 30 and more.
You need to reapply a sunscreen every 2-3 hours specially when you are outdoors.
At night you may use a cream containing one or more of many pigment reducing agents e.g
kojic acid,
hydroquinone,
glycolic acid, arbutin, tretinoin, fluocinolone acetonide etc either alone or more commonly as a combination.
These are prescription products and therefore I suggest that you talk to a
dermatologist for the needful.
You may also opt for a few sessions of chemical peeling e.g glycolic peel from your treating dermatologist.
Regards